Electric motor.



E. s. PILLSBURY.

ELECTRIC MOTOR. APPLICATION FILED APR.11, 1911:

1,093,074. Patented Apr. 14, 1914.

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vB. s. PILLSBURY.

ELECTRIC MOTOR.

APPLICATION FILED APR.1],1911.

Patented Apr. 14, 1914.

3 SHEETS-SHEET 3.

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UNITED STATES PATENT OFFICE.

EDWIN s. rILLsm'mY, on ST. Louis, MISSOURI, ASSIG-NOB. TO CENTURY ELECTRIC COMPANY, A CORPORATIONOF MISSOURI.

ELECTRIC MOTOR.

Specification of Letters Patent.

Patented Apr. 14, 1914.

To all whom it may concern:

Be it known that LEDWIN S. PILLSBURY, a citizen ofthe United States, residingat St. Louis, in the State of. Missouri, have 1nvented certain new and useful Improvements in Electric Motors, of which the following is a specification, D

The principal object of my nvention Is to provide a new and improved motor suitable for driving a fan.

Another object of my invention is to provide a new and improved centrifugal mechanism by which the circuit connectlons of an electric motor may be changed after it has attained a certain s eed.

All these objects and ot ers will bemade apparent in the following specification and claims, when taken in connection with the accompanying drawin s.

For the purpose. 0 illustrating and explaining the principles involved in my 1nvention I have shown a specific embodiment thereof in the drawings filed herewith, and I now proceed to describe the same.

Figure 1 is a horizontal section of the motor. Figs. 2 and 3.are horizontal sections of the motor armature,-showing the centrifugal mechanism at starting and at speed, respectively. Fig. 4 isa cross section of the armature, taken on the line 4 of Fig. 1. Figs. 5, 6, 7 and 8 are perspective views of elements of the centrifugal mechanism.

The motor frame or stator frame consists of the main part 64 with an integral end plate on oneside and a removable end plate 26 on the other side, these end plates carry ing the bearings for the. rotor shaft.

The armature 7O is of ordinary squirrel cage type. Spaced equiangularly around its axis are three rectangular slots 7l extending parallel to the axis. A fixed abutment 72 is clamped on the armature shaft-at one end,

and thiscarriesa spider with three lugs 73 opposite the respective slots 71. lVithineach slot 71 there is-a toggle mechanism comprising the two members 74and 75 engaging one another by aknife edge and groove joint, the member 74 having its extrcm'e end pivoted under the fixedlug 73 and the member 75 having its extremeend pivoted under the lug 76 on a collar which surrounds the armature shaft. The members 74 and 75 are built up'from punchings of sheet metal riveted together. Themiddle punching of 74 carries an extension tongue groove 81. The end plate of the motorhas an annular boss 84 cast integral therewith which surrounds the armature shaft and upon whichthe Sleeve 83 is mounted. This sliding sleeve 83 carries a channel ring 85, filled with insulating material 86, and within this insulating material is embedded a metal ring 87. Brushes 88 are secured by insulating supports to the end plate of the motor, and their extremities rest upon the metal ring 87 or upon the insulating material SGadjacent thereto. [Compare Figs. .Z-and 3]. A helical spring 89 acts between the ring plate 77 and the nut 90, which latter constitutes an abutment fixed on the armature shaft 37; thus the spring 89 tends to-- ing on the toggle members 74 and 75 will throw them out to the position shown in Fig. 3, thus pushing the ring 7 6-7 7 against the spring 89 andshifting the sleeve 85 to the left. *lVhen the speed of the motor is reduced again, the force of the sprin 89 will throw the toggle members down from the position shown in Fig. 3 to that shown in Fig. 2.

I claim 1. In an electric motor, a.shaft,-a rotor thereon, said rotor comprising a plurality of annular laminae and having a slot through said laminae eccentric to the shaft, an electric conductor for'said motor comprising adisplacementelement, means automatically to displace said element at a certain speed comprising toggle mechanism within the said eccentric slot, an abutment fixed relatively to the rotor to which one 'member of the toggle mechanism is pivoted,

2. In an electric motor, a shaft, a rotor thereon, said rotor having a plurality of equally spaced slots around its axis, an electric conductor for said motor, means automatically to change the continuity of said conductor at a certain speed comprising two heavy toggle members in each slot, an abutment fixed relatively to the rotor for one of each pair of toggle members, a sliding abutment for the other member of each pair, said toggle members lying entirely between said abutments and adap ed to push said abutments apart when acted upon by centrifugal force, and a member comprised in said electric conductor and operated by said sliding abutment to change the continuity of the same.

3. In an electric motor, a rotor shaft, a conductor for the motor, a centrifugal device to change the conductor at a. certain speed comprising a fixed abutment on the rotor shaft, a sliding abutment on the rotor shaft, a spring adapted to push the sliding abutment toward the fixed abutment, and a pair of toggle members acting between the two abutments, said toggle members being weighted and the entire weight thereof lying between the two abutments.

4. In an electric motor, a rotor, a rotor shaft, an end plate, a conductor for the motor, means automatically to change the conductor at a certain speed comprising an annular boss projecting beyond the rotor from the end plate of the motor and sur rounding the rotor shaft, an insulated ring slidably mounted onsaid boss, two contact terminals adapted to rest on said ring and be electrically connected thereby, said ring and terminals bcin r comprised in said conductor, and centri .ugal mechanism carried by the rotor to displace said ring in an axial direction.

5. In an electric motor, a rotor, a rotor shaft, an end plate, a conductor for the motor, and means automatically to change the relation of the parts of the conductor at a certain speed comprising an annular boss projecting toward the rotor from the end plate of the motor and surrounding the rotor shaft, a sliding sleeve on said boss having an outwardly turned flangev on the end thereof toward the rotor, a collar hav ing an inwardly directed groove engaging said flange, said collar being mounted to rotate with the rotor, an insulated metal ring carried by said sliding sleeve, contact terminals resting on said ring, and centrifugal mechanism engaging the said collar and adapted to displace the same.

6. In an electric motor, an armature having holes therein parallel with the axis and spaced equidistantly around the axis, toggle joint members within said holes, each said member comprising sheet metal punchings laid side by side and riveted together, and

contact changing elements adapted to be displaced by said toggle joint members.

7. In an electric motor, a. shaft, an annature thereon, a fixed spider on the shaft at one end of the armature, a sliding spider on the shaft at the other end of the armature, said armature having an eccentric slot therethrough, and toggle joint members within the slot, the extreme ends thereof engaging the respective spiders, and the intermediate ends engaging one another by a knife edge and groove joint.

8. In an electric motor, a shaft, an armature thereon, a fixed spider on the shaft at one end of the armature, a sliding spider on the shaft at the other end of the armature, said armature having an eccentric slot therethrough, and toggle joint members within the slot, the extreme ends thereof engaging the respective spiders, and the intermediate ends engaging one another by a knife edge and groove joint, the knife edge member having a projecting tongue and the gr'oove member having a slot to receive said tongue.

9. In an electric motor, a'shaft, an armature thereon, a fixed spider on the shaft at one end of the armature, a sliding spider on the shaft at the other end of the armature, said armature having an eccentric slot therethrough, and toggle joint members within the slot, the extreme ends thereof engaging the respective spiders, and the intermediate ends engaging one another by aknife edge and groove joint, the toggle members being built up of sheet metal punchings riveted together, the intermediate punching of the knife edge member having a projecting tongue and the corresponding punching of the groove member having a slot to receive said tongue.

10. In an electric motor, a rotor, a rotor shaft, said rotor having an eccentric slot therein, a conductor for the motor, means automatically to change the conductor at a certain speed comprising a centrifugal weight within said eccentric slot in the rotor, an abutment fixed relatively to the rotor, another abutment slidably mounted on the rotor shaft, an electric contact member comprised in said conductor and controlled by said sliding abutment, and connections from the said centrifugal weight to the said two abutments.

11. In an electric motor, a rotor, a rotor shaft, said rotor having an eccentric slot therein, a conductor for the motor, means automatically to change the conductor at a certain speed comprising a centrifugal weight within said eccentric slot in the rotor, an abutment fixed relatively to the rotor, another abutment slidably mounted on the rotor shaft, an electric contact member comprised in said conductor and controlled by said sliding abutment, and means plate adapted to permit the latter to slide lon 'tudinally with respect to the rotor sha t, two contact terminals adapted to rest on said ring and be electrically connected thereby, and centrifugal mechanism carried by the rotor to displace said ring in an axial direction.

In testimony whereof, I have subscribed my name.

EDWIN S. PILLSBURY.

Witnesses J. RUSSELL, J om: Hnnorr.

Correction-in Letters Patent No. 1,093,074.

' Signed and sealed this 12th day of May, A. D., 1914.

It is hereby certified that in Letters Patent No. 1,093,074, granted April 14, 1914-, upon the application of Edwin S. Pillsbury, of St. Louis, Missouri, for an improvement in Electric Motors, an error appears in the printed specification requiring correction as follows: Page 1, line 101, forthe word displacement read displaceable; and that the said Letters Patent should be read with this correction therein that'the same may conforinto the record of thecasein the Patent Olfice.

. J. '11 NEWTONQ I Acting Commissioner of Patenta. 

